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Investment Securities, Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Available-for-Sale:    
Less than 12 Months, Fair Value $ 219,551 $ 234,467
Less than 12 Months, Unrealized Losses 4,337 4,985
12 Months or More, Fair Value 4,424 4,696
12 Months or More, Unrealized Losses 139 147
Held-to-Maturity:    
Less than 12 Months, Fair Value 22,183 28,459
Less than 12 Months, Unrealized Losses 467 468
12 Months or More, Fair Value 2,586 2,564
12 Months or More, Unrealized Losses 79 101
U.S. Treasury notes [Member]    
Available-for-Sale:    
Less than 12 Months, Fair Value 11,090 16,076
Less than 12 Months, Unrealized Losses 33 76
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
U.S. Agency notes [Member]    
Available-for-Sale:    
Less than 12 Months, Fair Value 77,741 69,784
Less than 12 Months, Unrealized Losses 1,723 1,848
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
U.S. Agency mortgage-backed securities [Member]    
Available-for-Sale:    
Less than 12 Months, Fair Value 62,000 64,564
Less than 12 Months, Unrealized Losses 1,145 1,310
12 Months or More, Fair Value 3,393 3,518
12 Months or More, Unrealized Losses 128 134
Non-taxable Municipal securities [Member]    
Available-for-Sale:    
Less than 12 Months, Fair Value 58,461 72,867
Less than 12 Months, Unrealized Losses 1,334 1,621
12 Months or More, Fair Value 301 451
12 Months or More, Unrealized Losses 0 2
Held-to-Maturity:    
Less than 12 Months, Fair Value 19,061 20,429
Less than 12 Months, Unrealized Losses 289 251
12 Months or More, Fair Value 2,586 2,564
12 Months or More, Unrealized Losses 79 101
Taxable Municipal securities [Member]    
Available-for-Sale:    
Less than 12 Months, Fair Value 8,957 9,721
Less than 12 Months, Unrealized Losses 59 82
12 Months or More, Fair Value 450 450
12 Months or More, Unrealized Losses 3 3
Held-to-Maturity:    
Less than 12 Months, Fair Value 3,122 8,030
Less than 12 Months, Unrealized Losses 178 217
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Mutual funds [Member]    
Available-for-Sale:    
Less than 12 Months, Fair Value 1,211 1,205
Less than 12 Months, Unrealized Losses 37 37
12 Months or More, Fair Value 280 277
12 Months or More, Unrealized Losses 8 8
Trust preferred securities [Member]    
Available-for-Sale:    
Less than 12 Months, Fair Value 49 49
Less than 12 Months, Unrealized Losses 0 1
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Equity securities [Member]    
Available-for-Sale:    
Less than 12 Months, Fair Value 42 201
Less than 12 Months, Unrealized Losses 6 10
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses $ 0 $ 0